Premiere Pro - importing project problem!

I have made a film and seperate scenes are in seperate projects. Whenever i import a project the video works fine but the sound turns crackly and is deeper in pitch. My project is all in PAL widescreen 48khz, my movie files are in DV AVI. They work fine importing the video files on there own and audio is excellent too. But not when importing from another project!!!!

Also, i rendered a scene with an image in and the image quality went down. It seems pixelated.